<template>
 <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
        <!-- 添加分类按钮 -->
        <el-row>
            <el-col>
                <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
            </el-col>
        </el-row>
        <!-- 表格 -->
        <tree-table :data="catelist" :columns="columns"
        :selection-type="false" :expand-type="false"
        show-index border :show-row-hover="false" class="treeTable">
            <!-- 是否有效 -->
            <template slot="yes" slot-scope="scope">
                <i class="el-icon-success" 
                v-if="scope.row.cat_deleted ===false" 
                style="color:lightgreen;"></i>
                <i class="el-icon-error" v-else
                style="color:red;"></i>
            </template>
            <!-- 排序 -->
            <template slot="order" slot-scope="scope">
                <el-tag size="mini" 
                v-if="scope.row.cat_level===0"
                >一级</el-tag>
                <el-tag type="success" size="mini"
                v-else-if="scope.row.cat_level===1"
                >二级</el-tag>
                <el-tag type="warning" size="mini"
                v-else
                >三级</el-tag>
            </template>
            <!-- 操作 -->
            <template slot="opt" slot-scope="scope">
                <el-button type="primary" 
                size="mini" 
                icon="el-icon-edit" 
                @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
                <el-button type="danger" 
                size="mini" 
                icon="el-icon-delete"
                @click="removeCateById(scope.row.cat_id)">删除</el-button>
            </template>
        </tree-table>
        <!-- 分页 -->
        <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[5, 10, 20, 50]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total">
        </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisible"
        width="40%" @close="addCateDialogClosed">
        <!-- 添加分类的表单 -->
        <el-form :model="addCateForm" :rules="addCateFormRules" 
        ref="addCateFormRef" label-width="100px">
            <el-form-item label="分类名称" prop="cat_name">
                <el-input v-model="addCateForm.cat_name"></el-input>
            </el-form-item>
            <el-form-item label="父级分类">
                <!-- options指定数据源 -->
                <!-- props指定配置对象 -->
                <el-cascader
                    expand-trigger="hover"
                    v-model="selectedKeys"
                    :options="parentCateList"
                    :props="cascaderProps"
                    @change="parentCateChanged"
                    clearable
                    >
                </el-cascader>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改分类的对话框 -->
    <el-dialog
        title="修改分类"
        :visible.sync="editCateDialogVisible"
        width="40%" @close="editCateDialogClosed">
        <el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="80px">
            <el-form-item label="分类名称" prop="cat_name">
                <el-input v-model="editCateForm.cat_name" ></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editCateInfo">确 定</el-button>
        </span>
    </el-dialog>
 </div>
</template>
<script>
 export default {
     data(){
         return{
             //查询条件
             queryInfo:{
                 type:3,
                 pagenum:1,
                 pagesize:5
             },
             //商品分类的数据列表，默认为空
             catelist:[],
             total:0,
             //为table指定列的定义
             columns:[
                {
                    label:'分类名称',
                    prop: 'cat_name'
                },
                {
                    label:'是否有效',
                    type:'template',
                    template: 'yes'
                },
                {
                    label:'排序',
                    type:'template',
                    template: 'order'
                },
                {
                    label:'操作',
                    type:'template',
                    template: 'opt'
                }
             
             ],
             addCateDialogVisible:false,
             addCateForm:{
                //将要添加的分类的名称
                cat_name:'',
                //父级分类id
                cat_pid:0,
                //分类等级，默认添加的为1级分类
                cat_level:0
             },
             addCateFormRules:{
                 cat_name:[
                    {
                        required:true, message:'请输入分类名称', 
                        trigger:'blur'
                    } 
                 ]
             },
             //父级分类的列表
             parentCateList:[],
             //指定级联选择器的配置对象
             cascaderProps:{
                  value:'cat_id',
                  label:'cat_name',
                  children:'children',
                  checkStrictly:true
                             
             },
             //选中的父级分类的id数组
             selectedKeys:{},
             //控制修改分类对话框的显示与隐藏
             editCateDialogVisible:false,
             //查询到的分类信息对象
             editCateForm:{},
             //修改分类的验证规则对象
             editCateFormRules:{
                 cat_name:[
                     {required: true,message:'请输入角色名',trigger:'blur'}
                 ]
             }
         }
     },
     created(){
         this.getCateList()
     },
     methods:{
         //获取商品分类数据
        async getCateList(){
             const {data:res}=await this.$http.get('categories',{params:this.queryInfo})
             if(res.meta.status!==200){
                  return this.$message.error('获取商品分类失败')
             }
             //数据列表赋值给catelist
             this.catelist =res.data.result
             //为总数据条数赋值
             this.total =res.data.total
         },
         //监听pagesize改变的事件
         handleSizeChange(newsize){
             this.queryInfo.pagesize= newsize
             this.getCateList()

         },
         //监听pagenum改变的事件
         handleCurrentChange(newPage){
             this.queryInfo.pagenum= newPage
             this.getCateList()
         },
         showAddCateDialog(){
             //获取父级分类的数据列表
            this.getParentCateList()
            this.addCateDialogVisible=true
         },
         //获取父级分类的数据列表
         async getParentCateList(){
            const {data:res}=await this.$http.get('categories',{params:{
                type:2
            }})
            if(res.meta.status !==200){
                return  this.$message.error('获取父级分类数据失败')
            }
            this.parentCateList=res.data
         },
         //选择项变化触发这个函数
         parentCateChanged(){
             if(this.selectedKeys.length>0){
                //父级分类的id
                this.addCateForm.cat_pid= this.selectedKeys[this.selectedKeys.length-1]
                //为当前父级分类的等级赋值
                this.addCateForm.cat_level=this.selectedKeys.length

                return
             }else{
                 //父级分类的id
                this.addCateForm.cat_pid= 0
                //为当前父级分类的等级赋值
                this.addCateForm.cat_level=0
             }
         },
         //点击确定，添加新的分类
         addCate(){
             this.$refs.addCateFormRef.validate(async valid=>{
                 if(!valid) return
                const {data:res}=await this.$http.post('categories',this.addCateForm)
                if(res.meta.status!==201){
                    return  this.$message.error('添加分类失败')
                }
                 this.$message.success('添加分类成功')
                 this.getCateList()
                 this.addCateDialogVisible=false
             })
         },
         addCateDialogClosed(){
             this.$refs.addCateFormRef.resetFields()
             this.selectedKeys=[]
             this.addCateForm.cat_pid=0
             this.addCateForm.cat_level=0
         },
         async showEditCateDialog(id){
            const {data:res}=await this.$http.get('categories/'+id) 
              if(res.meta.status!==200) {
                  return this.$message.error('查询分类信息失败！')
                }
                this.editCateForm=res.data
                this.editCateDialogVisible=true
         },
         editCateDialogClosed(){
             this.$refs.editCateFormRef.resetFields()
         },
         editCateInfo(){
             this.$refs.editCateFormRef.validate(async valid=>{
                 if(!valid) return
                 const {data:res}=await this.$http.put('categories/'+this.editCateForm.cat_id,{
                     cat_name:this.editCateForm.cat_name
                     })
                  if(res.meta.status!==200){
                    return  this.$message.error('更新分类信息失败！')
                }
                //关闭对话框
                this.editCateDialogVisible=false
                //刷新数据列表
                this.getCateList()
                //提示修改成功
                this.$message.success('更新分类信息成功！')

             })
         },
         async removeCateById(id){
           const confirmResult =await this.$confirm('此操作将永久删除该分类, 是否继续?', 
                '提示', 
                {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }
            ).catch(err=>err)
            //用户确认删除，返回值未字符串confirm
            //用户取消删除，返回字符串cancel
            if(confirmResult!=='confirm'){
                return this.$message.info('已取消删除')
            }
            const {data:res} = await this.$http.delete('categories/'+id)
            if(res.meta.status !==200){
                return this.$message.error('删除用户失败！')
            }
            this.$message.success('删除用户成功！')
            this.getCateList()  
         }

     }
 }
 </script>
<style lang="less" scoped>

.treeTable{
    margin-top: 15px;
}
.el-cascader{
    width: 100%;
}
</style>